Brake



BRAKE Filed nay s 1926 if @f 5 Sheets-Sheet 1 Nov. 29, 1927.

M. w. McoNK'EY BRAKE Filed May 5 1926 3 Sheets-Sheet 2 INVENTOR fum] Nov. 29, 1927. 1,651,142v

` M. w. McoNKEY BRAKE Filed May 5 1926 3 Sheets-Sheet 3 F/GJ INVENTOR Patented Nov. 29, 1927.

UNITED STATES PATENT OFFICE.

MONTGOMERY W. MCCONKEY, F CHICAGO, ILLINOIS, ASSIGlNOR TO vIBEN'DIIIX. BRAKE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE.

Application led May 3, 1926. Serial No. 106,219.

This invention relates to brakes, and is illustrated as embodied in two internal expanding automobile brakes. An object of the invention is to provide means' for preserving, as the brake lining wears, a uniform applying movement of the cam or an equivalent brake-applying device.

In one desirable arrangement, the cam or its equivalent engages 'a stop which predetermines its idle position, and which is arranged to be. adjusted automatically by brake-applying movement in excess of uniform movement ldesired'. Preferably there is a part, shown integral with the stop,

which is engaged and automatically shifted lar constructions, will be apparent from they following description of the illustrative embodiments shown in the accompanying drawings, in which: y

Figure 1 is a vertical sez-tion through one front brake and through associated parts;

Figure 2 is a section through the cam on the line 2 2 of Figure 1, showing the rela tion of the cam to the stop device;

Figure 3 i-s a vertical section through the brake, on the line 3-3 of Figure 1, showing the shoes in side elevation;

Figure 4 is a sectional detail, showing a stop for the connected ends of two of the shoes; v i

HFigure 5 is a vertical section corresponding to Figure 3, but showing a different brake;

Figure 6 is a partial elevation, looking outwardly from inside the wheel toward the backing plate of the brake of Figure 5;

the 1 Figure 7 is a detail section on the line 7-I-7 of Figure 6, showing the means permitting the camshaft bracket to shift;

Figure 8 is a section on the line 8-8 of Figure 1, showing the mounting of the brake-applying means; and

Figure 9 is a perspective of the frictionally-held sleeve.

Each of the the open side of which is arranged a suitable backing plate 12, and within which is arranged the frictionvrneans of the brake. Drum 10 is arranged to rotate with a wheel (not shown) mounted on the spindle'14 of e front wheel knuckle 16 swivelled, by a kingpin 18 or the like, at one end of an axle 20. The brake may be applied by means such as a horizontalwlever 22 (Figure 1) or 24 (Figure 6), fulcrumed on axle 2O and having a ball end 26 engaging the flattened end of a brake-applying crank arm or lever 28. lVhen the brake is applied, the center of ball 26 is in or immediately adjacent the swivelling axis vof the Wheel,-i. e. the aXis of king-pin 18. V

The friction means of the brake of Fivures 1-4 includes three shoes 30, 32, and 34. Shoes 30 and 32 are pivotally connected by a pivot pin 36, having a groove` in the end next backing plate 12 which is embraced by a fork or jaw in a radially-arranged stop 38 having a stem 40 passing through the backing plate 12 and clamped frictionally thereto by means such as a nut threaded on the end of the stem. The fork or jaw 38 has clearance equal to the desired releasing movement of pin 86, so that the fork serves as a stop determining the idle position of shoe 32 while at the same time as the lining wears it is automatically shifted by the brake-applying movement ofv pin 36 to adjust its position.

v Shoe 32 is anchored on a pivot pin 42 on the backing plate 12, while shoe 34 is anchored on a similar pin 44, shoe 34 having a suitable opening near its anchored end through which the end of shoe 32 passes. The brake is applied by suit-able means such as a double cam brakes includes a drum 10, at;

resistance of a return spring 54, whereuponl shoe 30l moves about the drum to apply shoe 32 against the resistance of an auxiliary return spring 56.

The brake of Figures 5 and 6' includes a pair of shoes 58 and 60, held against afloatmg pivot 62 by a spring 64 so that in effect they are pivotally connected, and with their free ends urged by a. return spring 66 against adjustable anchors 68. A centering spring 7 0 is connected to a lever 72 pivotefl on the backing platev 12 and having -.a double wedge surface embracing and tending to center the pivot l62. .l

The above-described brakes, except as further explained below, form no part of my present invention, which relates to novel means for automatically adjusting a stop for the cam 46, or an equivalent brake-applying member. In the particular embodiment selected for illustration, the stop/'is in the form of a part or lug 80 on a flange 82 at one end and which sleeve` in turn is journalled in bracke,t 50. Flange 82 also has another part or lug 86 on the opposite side of ythe cam. Sleeve 84 is confined between cam 46 and the hub of arm 28, and is threaded at its end for a nut 88 which frictionally clamps i o bracket 50, to resist angular movement, of

the sleeve in the bracket, .nut 88 being received in a relatively large opening in the backing plate. Lugs 80 and 86x are spaced apart by a distance equal to the'width of the cam plus thedesired predetermined brake-applying movement of the cam.

' Bracket 50 has bosses 90 (Figure 7) projecting through slots 92 in the backing plate,

., and carrying st-uds 94 threaded to receive nuts 96 clamping washers 98 against the ends of bosses 90, thus embracing backing plate 12 between bracket50 and washers 98 in a manner permitting the bracket to shift to center cam 46.

In operation, application of the brake will cause cam 46 to engage part 86 after apredetermined movement, to shift sleeve 84 and part 80 v(if necessary) against the frictional resistance of nut 88. When the brake is released, cam l46 can only turn back unt-il it` engages part- 80 again, so that no matter hbw much the brake lining wears the cam always has a predetermined movement limited by the relative positions of'parts 80 and 86, and fixed by their distance apart (i. e. by the amount by which their distance apart exceeds the width of the cam).

As the lining wears, arm 28 maybe adjust-v ed angularly of shaft 48, to preserve its relation to the swivelling. axisofflthe wheel,

-by turning a clamping bolt 10() in the split -hub meshing with worm Jeeth 102 cut in shaft 48,after which tighteningV up a nutA 104 on the bolt serves to preventjturning of the bolt at the same time'that it contracts' the split hub onto the shaft.

Whilea particular construction has been described in detail, it is not my intention to limit the scope ofthe invention to that particular construction, or otherwise than by the terms of the appended claims.

1. brake comprising, in combination, a brake-,applying device, a stop ,determining the idle position of said device, and means operated by the application of the brake for shifting the stop automatically to maintain a` uniform distance of brake-applying movement of said device as the brake wears.

2. A brake comprising, in combination, a brake-applying device, and means determina ing the'idle position of said device arranged to be operated by the application of the brake automatically to maintain a uniform distance of brake-applying movement of ysaid device as the brake wears. of a sleeve'84 in which shaft 48 is journalled,

3. A brake comprising, in combination, friction means, lan applying devi-ce for said means including a shaft, astop limiting ,the return movement of the shaft when the brake is released, and means for shifting the stop as the friction means x ears lto preserve a predetermined releaseA movement of the shaft. v

`4. A brake comprising, in combination, friction means, an ap lying device for said means including a s aft, a)stop limiting the return movementfof the shaft when the brakjeis released, and ens operated by movement f the shaft in pplyingthe brake for shifting the stop as the friction means wears to preserve -a predetermined release movementof .the shaft.

5. A brake comprising, in combination, friction means, a' cam for applying the friction means, 'a stop determining the idle posi- 7. A brake comprising, in combination, a.

brake-applying camfand a frictionally-held device havingpartslon opposite sides of the cam and allowing a predetermined movement of the cam before shifting, one of saidV parts serving as a stop to predetermine the idle position of said cam andthe other en- -gaged by excessive movement of the cam to langularly-movable brake-applying member,

and a frictionally-held device having parts on opposite sides of said member and allowing a redetermined movement of the member be ore shifting, one of saidparts serving as a stop to predetermine the idle position of said member and the other engaged by excessivemovement of the member to shift the stop part. y

9. A brake comprising, in combination, a drum, a backing plate at the open side of the drum, friction means between the drumv and backing plate, an applying device for said means'withinthe drum, a stop within the drum determining the position of the ap,- plying device when the brake is released and apart operated by applying movement of the device to shift the stop to preserve a uniform release movement of said device as the fric'tion means wears, and means accessible from outside the backing plate for frictionally clamping the stop and said part. 10. A brake comprising, in combination, a drum, a backing plate at the open side of the drum, friction means between the drum and backing plate, an applying device for said means within the drum, a shaft for said device extending through the backing plate, a stop within the drum determining the position of the applying device when the brake is released, and a part operated by applying movement of the device to shift the stop to preserve a uniform release movement of said device as the friction means wears, and means accessible from outside the backing plate adjacent the shaft for frictionally clamping the stop and said part.

11. A brake comprising, in com ination, a drum, a backing plate at the open side of the drum, friction means between the drum and a backing plate, an applying device for said means within the drum, a shaft for said device extending through the backing plate, a stop within the drum determining the position of thel applying device when the brake is released, and a part operated by aplying movement of the device to shift the stop to preserve a uniform `release movement of said device as the friction means wears, and a sleeve surrounding the shaft and carrying the stop and said part.

" 12. A brake comprising in combination, a drum, a backing plate at the open side of the drum, friction means between the drum nd backing plate, an applying device for' said means within the drum, a shaft for said de- .v ice extending through the backing plate, a lstop within the drumgdet mining the position of theapplying ldevi ewhen the brake is released, and a part 'operated byapplying movement of the deviceLg-to shift the stop to preserve a uniform release movement of said device as the friction means wears, a sleeve surrounding the-(shaft and carrying the stop and said part, and means for frictionally clamping the sleeve against movement.

13. A sleeve to surround a brake camshaft, having a thread at one end for a clamping nut., and having at its other end two lugs lspaced apart a distance greater than the width of the brake cam byan amount equal to the desired release movement of the cam.

14. A sleeve to surround a brake camshaft, having a thread at one end' for a clamping nut, and having at its other end a flange perpendicular to the sleeve axis and formed with two lugs projecting on opposite sides of a cam on the camshaft and spaced apart a distance greater than the width of the cam by an amount equal to the desired release movement of the cam.

15. A brake-operating device including a bracket, a sleeve journalled -in the bracket and having a pair of angularly-spaced lugs at one end, a camshaft journalled in the sleeve and having a cam received between said lugs, and means frictionally resisting shifting of the sleeve.

16. A brake-operating device including a bracket, a sleevejournalled in the bracket and having a pair of angularly-spaced lugs at one end, a camshaft 4journalled in the sleeve and having a cam received between said lugs, and means frictionally clamping the sleeve to the bracket.

17. A brake-operating device including a bracket, a sleeve projecting through the bracket and threaded at one end and formed with angularly-spaced lugs at the other end', a nut threaded on the sleeve against the bracket and resisting angular movement of the sleeve, a shaft journalled in the sleeve, and a brake-applying member arranged bctween said lugs and operated by the shaft.

18. A brake-operating device including a bracket, "a sleeve projecting through the bracket and threaded at one end and formed with angularly-spaced lugs at the other end. a nut threaded on the sleeve against the bracket and resisting an ular movementI of the sleeve, a shaft journa led in the sleeve, a brake-applying 'member on one end ofthe shaft arranged between said lugs and operated by the shaft, and an operating arm on the other end of the shaft beyond the end of the sleeve.

19. A brake-operating device including a bracket, axgsleeve projecting through the bracket and threaded at one end and formed with angularly-spaced lugs at the other end, a nut threaded on the sleeveagainst the bracket and resisting angularl movement of the sleeve, a shaft journalled in the sleeve,a brake-applying member on one end of the shaft arranged between said lugs and operated by the shaft, an operating arm on the fao other @nd of the Shaft beyond the end iofthe sleeve, and means for adjusting `the arm angularly of the shaft. v

20. AL brake comprising, vin combination, friction means Vhaving adjacent separable ends, an applying device engaging said ends, a bracket supporting the applying` device,v means engaging the bracket in a manner resisting shiftinglwith respect to the bracket 10 and Yincluding a part serving asa. stop to predetermine the idle position of the applying device and another part operated by applying the brake to adjust the, stop part, and means' supporting the bracket'in a manner -permitting it to shift to center thebrakeapplying device automatically With' respect to the friction means. l

In testimony whereof, I have hereunto signed my name.

MQNTGOMERY W. MCCONKEY. f 

